231221031201031 has 24 divisors (see below), whose sum is σ = 246145229222400. Its totient is φ = 217156447924416.

The previous prime is 231221031201023. The next prime is 231221031201067. The reversal of 231221031201031 is 130102130122132.

It is not a de Polignac number, because 231221031201031 - 2³ = 231221031201023 is a prime.

It is a super-2 number, since 2×231221031201031² (a number of 30 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 231221031200993 and 231221031201011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231221031201071) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 56571945 + ... + 60521293.

It is an arithmetic number, because the mean of its divisors is an integer number (10256051217600).

Almost surely, 2^{231221031201031} is an apocalyptic number.

231221031201031 is a deficient number, since it is larger than the sum of its proper divisors (14924198021369).

231221031201031 is a wasteful number, since it uses less digits than its factorization.

231221031201031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3950791 (or 3950772 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 22.

Adding to 231221031201031 its reverse (130102130122132), we get a palindrome (361323161323163).

The spelling of 231221031201031 in words is "two hundred thirty-one trillion, two hundred twenty-one billion, thirty-one million, two hundred one thousand, thirty-one".